Could you help me with mine program electricity for puppy linux I'm doing. I want to do the calculations by pressing "enter" instead of pressing the button "calculate". Could you do that for me?. Now I send the files.
I'd also like to know how to make programs in a single window with multiple tabs, each program in each tab.

I would like to be able to run netcat in backgrounded listening mode when I start the computer. If someone was to call me using netcat, my system should open a chat window so the caller and callee can chat.

It's easy enough to do it in two terminal on the local and remote computer.

EG: listening computer:
netcat -lp <port>

EG: Calling computer:
netcat 192.168.x.x <port>

Both terminals will connect and you can chat in the terminal windows.

This can also be done on a WAN but you need to do some port forwarding.

I would also be happy just to use the terminal/console as long as it is backgrounded until invoked by the caller. I just don't want in in the tray until it's required.

Alternative to the above, all I need is some indication that the remote computer is online. I don't really need a chat client. When both computers are online each should be visible to each other. I guess a poke function would be useful just to let the other party know you want to communicate.